2. Type of anabolic steroid(s) used: All anabolic steroids exhibit suppression or shutdown of the HPTA through the mechanisms of the negative feedback loop, and there are no exceptions to this. Various anabolic steroids are known as being mildly suppressive, while others are known as being heavily suppressive. This is all reliant on various different reasons, many of which will not be discussed here. In any case, no matter how mild or severe an anabolic steroid exerts HPTA suppression, all anabolic steroids when utilized for typical cycle lengths of weeks at a time will eventually cause the HPTA to shut down, or at the very least severely suppress its hormonal signal processes.
Its action in the male body is like that of LH, stimulating the Leydig cells in the testes to produce testosterone even in the absence of endogenous LH. HCG is therefore used during longer or heavier steroid cycles to maintain testicular size and condition, or to bring atrophied (shrunken) testicles back up to their original condition in preparation for post-cycle Clomid therapy. This process is necessary because atrophied testicles produce reduced levels of natural testosterone, this situation should be rectified prior to post-cycle Clomid therapy.